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Merge pull request #10859 from SDaron/clipping-layer
Add an example of clipping layer based on a vector source
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#map { | ||
background: transparent; | ||
} |
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--- | ||
layout: example.html | ||
title: Vector Clipping Layer | ||
shortdesc: Vector Clipping Layer example | ||
docs: > | ||
Example of a clipping layer based on a vector source | ||
tags: "clipping, openstreetmap, vector" | ||
--- | ||
<div id="map" class="map"></div> |
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import Map from '../src/ol/Map.js'; | ||
import View from '../src/ol/View.js'; | ||
import {Tile as TileLayer, Vector as VectorLayer} from '../src/ol/layer.js'; | ||
import VectorSource from '../src/ol/source/Vector.js'; | ||
import GeoJSON from '../src/ol/format/GeoJSON.js'; | ||
import OSM from '../src/ol/source/OSM.js'; | ||
import {Fill, Style} from '../src/ol/style.js'; | ||
import {getVectorContext} from '../src/ol/render.js'; | ||
import {fromLonLat} from '../src/ol/proj.js'; | ||
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const base = new TileLayer({ | ||
source: new OSM() | ||
}); | ||
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const clipLayer = new VectorLayer({ | ||
style: null, | ||
source: new VectorSource({ | ||
url: | ||
'./data/geojson/switzerland.geojson', | ||
format: new GeoJSON() | ||
}) | ||
}); | ||
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const style = new Style({ | ||
fill: new Fill({ | ||
color: 'black' | ||
}) | ||
}); | ||
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base.on('postrender', function(e) { | ||
e.context.globalCompositeOperation = 'destination-in'; | ||
const vectorContext = getVectorContext(e); | ||
clipLayer.getSource().forEachFeature(function(feature) { | ||
vectorContext.drawFeature(feature, style); | ||
}); | ||
e.context.globalCompositeOperation = 'source-over'; | ||
}); | ||
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const map = new Map({ | ||
layers: [base, clipLayer], | ||
target: 'map', | ||
view: new View({ | ||
center: fromLonLat([8.23, 46.86]), | ||
zoom: 7 | ||
}) | ||
}); |